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Do you (or anyone else) think it makes sense to have a discussion of a separable morphism here? Glossary of scheme theory doesn't leave much room for more subtle issues. (eventually it should have its article though). --
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I removed the fourth entry, not because I thought it to be false, but because it is not a "characterization" of closed immersions. It is a
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About the 4th condition. Although EGA gives a proof, the following also works for me. (Forgive me if I'm missing something.)
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Knowledge. If you would like to participate, please visit the project page, where you can join
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Ok. (In case it's not obvious, I do appreciate your edits. The article looks much nicer.) --
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350:{\displaystyle f^{-1}(U_{ij})=\operatorname {Spec} (R_{ij}/I_{ij})}
255:{\displaystyle U_{i}=\cup U_{ij}=\operatorname {Spec} (R_{ij})}
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of closed immersions and belongs in the properties section.
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